Warming hiatus of extreme temperature across China's cold regions during 1998-2018  

作　　者：Luo MA Ruijie LU Dongxue CHEN 

机构地区：[1]Engineering Center of Desertification and Blown-Sand Control(Ministry of Education),Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [2]Key Laboratory of Environmental Change and Natural Disaster(Ministry of Education),Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China

出　　处：《Frontiers of Earth Science》2022年第4期846-864,共19页地球科学前沿（英文版）

摘　　要：The recent hiatus in global warming has attracted significant attention,yet whether it is a widespread global and/or regional phenomenon remains controversial.Here,we investigate the response of extreme temperature changes since 1961 across China's cold regions(CCR):Tibetan determine the spatiotemporal characteristics of extreme temperature changes across these cold regions using Mann-Kendall and wavelet transform coherence(WTC)analyses of data from 196 meteorological stations from 1961 to 2018.We further investigate the teleconnection between extreme temperatures and large-scale ocean-atmosphere circulation to determine the potential synoptic scale causes of the observed changes.The results revealed a significant warming slowdown in all extreme tempera-ture indices across CCR from 1998 to 2018.In addition,extreme temperature indices in northwest cold region(NWC)and north cold region(NC)reveal a clear winter warming slowdown and even a significant cooling trend,yet only the cold index in Tibetan Platean cold region(TPC)shows a warming hiatus.We conclude that the warming hiatus observed across these regions is primarily driven by extreme temperature index changes in winter.We also find that phase variations in the Atlantic Multi-decadal Oscillation(AMO)and Arctic Oscillation(AO)critically impact on the observed warming hiatus,but the specific atmospheric mechanisms are elusive and warrant further analysis and investigation.

关 键 词：China’s cold regions warming hiatus wavelet transform coherence ocean-atmosphere circulations 

分 类 号：P46[天文地球—大气科学及气象学]